With max 400 LED lumens and an improved eye-catching warning flashing mode, the TR400 delivers outstanding daytime visibility and can be seen from up to 2.6 km away. The rear light features a smart light-sensing mode that automatically switches between Daytime Flash and Breathing Mode according to ambient light conditions. It also comes with an intelligent brake sensor for enhanced safety and an auto on-off function for convenient operation. With up to 350 hours of runtime, IPX6 waterproof protection, dual mounting options for seatposts and saddle rails, a hidden USB-C charging port, and a built-in battery level indicator, the TR400 is ready for reliable riding in all conditions.